"I think he’s a smart guy that knows what’s going on ... and I think he is not going to want to destroy New York," Trump said of the race’s frontrunner. "I think he is going to want to make New York great."

"I think pretty strongly that he’ll end up being a good mayor , maybe a very good mayor and I don’t think he’s going to want to kill the golden goose," he added.

The praise comes amid reported fears in the business and banking communities over what a de Blasio administration would mean for them — especially after the 12-year tenure of business-friendly Mayor Michael Bloomberg.

In the radio interview, Trump also said he’s not interested in running for governor next year — but left open the possibility he might run for president in 2016 if the "right person" doesn’t emerge, the Daily News reported.

De Blasio, currently New York City’s public advocate, is leading Republican Joe Lhota by about 42 percentage points, according to an average of four recent polls compiled by RealClearPolitics.